* {
    padding: 0;
    margin: 0;
    list-style: none;
}

.banner {
    width: 800px;
    height: 500px;
    position: relative;
    margin: 20px auto;
    overflow: hidden;
}

.banner ul {
    width: 2000px;
    display: flex;
    position: absolute;
    left: 0;
}

.banner ul li {
    width: 800px;
    height: 500px;
    text-align: center;
    line-height: 300px;
    font-size: 100px;
    background-color: pink;

}

.banner ul li img {

    width: 800px;
    height: 500px;
}

.banner ol {
    position: absolute;
    bottom: 10px;
    width: 100%;
    display: flex;
    justify-content: center;
}

.banner ol li {
    width: 20px;
    height: 20px;
    background-color: #ddd;
    margin: 10px;
}


.banner ol .on {
    background-color: rgb(219, 82, 82);
}

.prev {
    position: absolute;
    left: 0;
    top: 150px;
}

.next {
    position: absolute;
    right: 0px;
    top: 150px;
}